CN107051016B - Composite modified gas-liquid coalescing filter - Google Patents
Composite modified gas-liquid coalescing filter Download PDFInfo
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- CN107051016B CN107051016B CN201710136861.6A CN201710136861A CN107051016B CN 107051016 B CN107051016 B CN 107051016B CN 201710136861 A CN201710136861 A CN 201710136861A CN 107051016 B CN107051016 B CN 107051016B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/62—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series
- B01D46/64—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in series arranged concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0002—Casings; Housings; Frame constructions
- B01D46/0005—Mounting of filtering elements within casings, housings or frames
- B01D46/0008—Two or more filter elements not fluidly connected positioned in the same housing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/266—Drying gases or vapours by filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2267/00—Multiple filter elements specially adapted for separating dispersed particles from gases or vapours
- B01D2267/30—Same type of filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2275/10—Multiple layers
Abstract
The application provides a composite modified gas-liquid coalescing filter, which comprises: a cylindrical skeleton; the first filter layer comprises a first nanofiber modified layer and a first micrometer fiber modified layer, the head end of the first nanofiber modified layer is wound outside the cylindrical framework, the head end edge of the first micrometer fiber modified layer is in seamless connection with the tail end edge of the first nanofiber modified layer, and the first micrometer fiber modified layer is wound outside the first nanofiber modified layer; the second filter layer comprises a second nanofiber modified layer and a second micrometer fiber modified layer, the head end edge of the second nanofiber modified layer is in seamless connection with the tail end edge of the first micrometer fiber modified layer, the second nanofiber modified layer is wound on the outer side of the first micrometer fiber modified layer, the head end edge of the second micrometer fiber modified layer is in seamless connection with the tail end edge of the second nanofiber modified layer, and the second micrometer fiber modified layer is wound on the outer side of the second nanofiber modified layer. The application can prevent the phenomenon of secondary entrainment.
Description
Technical Field
The application relates to the field of gas-liquid filtering devices, in particular to a composite modified gas-liquid coalescing filter.
Background
In the fields of natural gas, coal bed gas, compressed air and the like, liquid drop particles with different sizes are usually entrained in the gas, so that the gas quality cleanliness and the operation safety of related instruments and equipment are affected. The gas-liquid separation is generally carried out by adopting a gravity separator, an inertial separator, a cyclone separator, a gas-liquid coalescing filter or other filtering separation equipment. At present, gas-liquid coalescing filters are mostly used for droplets with smaller particle sizes, such as micron-sized droplets and submicron-sized droplets. The gas-liquid coalescent filter consists of an inner layer framework and an outer layer fiber filter material. Inorganic fibers such as metal fibers and glass fibers, and organic fiber materials such as polyester fibers and polypropylene fibers are commonly used gas-liquid coalescing filter materials, most of which are oleophilic, and generally require surface modification. Common surface modification methods are solution impregnation and plasma methods. The solution impregnation method has the defects of great solvent waste, complex treatment process, uneven treatment effect and the like. The plasma method is characterized in that the corresponding process gas is subjected to plasma treatment, and generated plasma is subjected to chemical reaction with the surface of an object, so that the surface cleaning, activating or modifying effects are achieved. The latter is generally classified into normal pressure plasma and low pressure plasma technologies, and the latter can form a vacuum environment in the processing chamber, so that the plasma can enter any surface inside the filter material, thereby achieving a very uniform and comprehensive surface treatment. For the oleophilic filter material, a layer of liquid film is easy to form on the air outlet surface in the filtering process, the liquid film is broken under the action of air flow to cause the secondary entrainment phenomenon of micron-sized liquid drops, and the occurrence of the secondary entrainment phenomenon can be reduced when the oleophobic filter material is selected, so that the filtering efficiency is improved.
With the development of instruments and equipment to high precision and the transition of air quality control from PM10 to PM2.5, the traditional gas-liquid coalescing filter has lower filtering efficiency on submicron liquid drops (especially liquid drops in the most penetrating particle size range) and can not meet the corresponding technical or environmental requirements. The nanofiber has smaller fiber diameter and pore diameter, so that liquid drops in the range can be effectively trapped, but the nanofiber has the oil-related property, so that a liquid film is easy to generate in the using process, a larger pressure drop occurs, and the characteristic of weak strength of the nanofiber is difficult to directly apply to the field of gas-liquid coalescence filtration.
The application patent of China with publication number CN 104307288A discloses a high-efficiency cyclone coalescent gas-liquid separator, which mainly comprises a container shell, a cyclone centrifugal separation section, a rectifying liquid collecting plate, a nanofiber coalescent separation section, a spiral separation section and other gradient components which are arranged from bottom to top; the container housing is provided with a mixed gas inlet, a purge gas outlet and a liquid phase outlet portion. The application effectively combines three separation methods such as gravity sedimentation, centrifugal separation and coalescence separation with the surface modification technology, has high separation efficiency and treatment capacity, and can effectively prevent the phenomenon of secondary entrainment. The application has the defects that: the application adopts a rotational flow method to reduce secondary entrainment of liquid drops, has complex overall structure and overlarge occupied area, and is not beneficial to installation and operation.
Chinese patent publication No. CN 105392544A discloses a gradient nanofiber filter media formed from multiple layers of media material comprising nanofiber media layers, wherein the multiple layers are laminated, bonded or otherwise combined with each other. The composite filter media may include at least one nanofiber modification layer comprising a polymer media material having a geometric mean fiber diameter of about 100nm to 1 μm and a plurality of fibers configured in a gradient such that the ratio of the geometric mean diameter of each fiber at the upstream face of the nanofiber modification layer to the geometric mean diameter of each fiber at the downstream face of the nanofiber modification layer is about 1.1 to 2.8, preferably about 1.2 to 2.4. The application has the defects that: the composite filter medium directly combines nanofiber modified layers with different diameters, is mainly used for liquid-solid filtration or liquid-liquid coalescence filtration, but the thickness of the nanofiber modified layer (at least 40 mu m) is too large, a liquid discharge channel is not arranged in the filter medium, and liquid is easy to remain in the medium, so that the phenomenon of overhigh pressure drop and secondary entrainment is caused, and the composite filter medium cannot be applied to the field of gas-liquid coalescence filtration.
Disclosure of Invention
The application provides a composite modified gas-liquid coalescing filter, which aims to reduce secondary entrainment of liquid drops.
The technical scheme adopted for solving the technical problems is as follows: a composite modified gas-liquid coalescing filter, the composite modified gas-liquid coalescing filter comprising: a cylindrical skeleton; the first filter layer comprises a first nanofiber modified layer and a first micrometer fiber modified layer, the first nanofiber modified layer and the first micrometer fiber modified layer are respectively wound on at least one circle of the cylindrical framework, the head end of the first nanofiber modified layer is wound outside the cylindrical framework, the head end edge of the first micrometer fiber modified layer is in seamless connection with the tail end edge of the first nanofiber modified layer, and the first micrometer fiber modified layer is wound outside the first nanofiber modified layer; the second filter layer comprises a second nanofiber modified layer and a second micrometer fiber modified layer, the second nanofiber modified layer and the second micrometer fiber modified layer are respectively wound on the cylindrical framework at least for one circle, the first end edge of the second nanofiber modified layer is in seamless connection with the tail end edge of the first micrometer fiber modified layer, the second nanofiber modified layer is wound on the outer side of the first micrometer fiber modified layer, the first end edge of the second micrometer fiber modified layer is in seamless connection with the tail end edge of the second nanofiber modified layer, and the second micrometer fiber modified layer is wound on the outer side of the second nanofiber modified layer.
Further, the composite modified gas-liquid coalescing filter further comprises a third filter layer, the third filter layer comprises a third nanofiber modified layer and a third microfiber modified layer, the first end edge of the third nanofiber modified layer is in seamless connection with the tail end edge of the second microfiber modified layer, the third microfiber modified layer is wound on the outer side of the second microfiber modified layer, the first end edge of the third microfiber modified layer is in seamless connection with the tail end edge of the third nanofiber modified layer, and the third microfiber modified layer is wound on the outer side of the third nanofiber modified layer.
Further, the pore diameters of the first nanofiber modified layer, the second nanofiber modified layer and the third nanofiber modified layer are gradually increased along the radial direction of the cylindrical framework from inside to outside; the pore diameters of the first micrometer fiber modified layer, the second micrometer fiber modified layer and the third micrometer fiber modified layer are gradually increased.
Further, the ratio of the pore diameter of the first nanofiber modified layer to the pore diameter of the second nanofiber modified layer is 0.3 to 0.9, and the ratio of the pore diameter of the first microfiber modified layer to the pore diameter of the second microfiber modified layer is 0.4 to 0.9.
Further, the pore diameter of the second nanofiber modified layer and the pore diameter of the third nanofiber modified layer have a ratio of 0.3 to 0.9, and the pore diameter of the second microfiber modified layer and the pore diameter of the third microfiber modified layer have a ratio of 0.4 to 0.9.
Further, the thicknesses of the first nanofiber modification layer, the second nanofiber modification layer and the third nanofiber modification layer are all 5 micrometers to 25 micrometers; the first, second and third microfiber modified layers are each 0.1 to 3mm thick.
Further, the inner side of the head end of the first micrometer fiber modified layer is attached to the outer side of the first nanometer fiber modified layer through a first adhesive layer, the inner side of the tail end of the first micrometer fiber modified layer is attached to the outer side of the tail end of the first nanometer fiber modified layer through a second adhesive layer, and the inner side of the head end of the second nanometer fiber modified layer is attached to the outer side of the first micrometer fiber modified layer through a third adhesive layer.
Further, the first adhesive layer, the second adhesive layer and the third adhesive layer are formed by a plurality of adhesive spraying points, and the adhesive spraying points of the first adhesive layer and the adhesive spraying points of the third adhesive layer are arranged in a staggered mode along the axial direction of the cylindrical framework.
Further, the composite modified gas-liquid coalescing filter further comprises a liquid drainage layer, wherein the head end edge of the liquid drainage layer is in seamless connection with the tail end edge of the second microfiber modified layer.
Further, the aperture of the liquid-repellent layer is 70 μm or more, and the thickness of the liquid-repellent layer is 0.1mm to 3mm.
Further, the height direction of the first filter layer and the height direction of the second filter layer are both set along the axial direction of the cylindrical skeleton, and the height of the first filter layer and the height of the second filter layer 30 are the same as the axial height of the cylindrical skeleton.
The method has the advantages that the method can ensure lower pressure drop, has higher filtration efficiency on submicron liquid drops (especially liquid drops in the range of the most penetrating particle diameter) and micron liquid drops, and can effectively reduce the phenomenon of secondary entrainment of liquid drops.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a front view in elevation of a cross-sectional configuration of an embodiment of a composite modified gas-liquid coalescing filter of the present application;
FIG. 2 is a top structural cross-sectional view of an embodiment of a composite modified gas-liquid coalescing filter of the present application;
FIG. 3 is a schematic illustration of staggered glue sprays in an embodiment of a composite modified gas-liquid coalescing filter of the present application;
FIG. 4 is a graph of experimental data relating liquid accumulation to pressure drop for an embodiment of a composite modified gas-liquid coalescing filter in accordance with the present application;
FIG. 5 is a graph of experimental data for particle size versus filtration efficiency for an embodiment of a composite modified gas-liquid coalescing filter of the present application.
Reference numerals in the drawings: 10. a cylindrical skeleton; 20. a first filter layer; 21. a first nanofiber modifying layer; 22. a first microfiber modified layer; 30. a second filter layer; 31. a second nanofiber modification layer; 32. a second microfiber modified layer; 40. a third filter layer; 41. a third nanofiber modification layer; 42. a third microfiber modified layer; 50. a liquid discharge layer; 61. a first glue spraying point; 62. and thirdly, spraying glue.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1 and 2, an embodiment of the present application provides a composite modified gas-liquid coalescing filter including a cylindrical skeleton 10, a first filter layer 20, and a second filter layer 30. The first filter layer 20 includes a first nanofiber modified layer 21 and a first nanofiber modified layer 22, the first nanofiber modified layer 21 and the first nanofiber modified layer 22 are wound around the cylindrical skeleton 10 at least for one circle, the head end of the first nanofiber modified layer 21 is wound around the outside of the cylindrical skeleton 10, the head end edge of the first nanofiber modified layer 22 is in seamless connection with the tail end edge of the first nanofiber modified layer 21, and the first nanofiber modified layer 22 is wound around the outside of the first nanofiber modified layer 21. The second filter layer 30 includes a second nanofiber modified layer 31 and a second nanofiber modified layer 32, and the second nanofiber modified layer 31 and the second nanofiber modified layer 32 are wound around the cylindrical skeleton 10 at least one round. The first end edge of the second nanofiber modified layer 31 is in seamless connection with the tail end edge of the first nanofiber modified layer 22, the first nanofiber modified layer 32 is wound on the outer side of the first nanofiber modified layer 22, the first end edge of the second nanofiber modified layer 32 is in seamless connection with the tail end edge of the second nanofiber modified layer 31, and the second nanofiber modified layer 32 is wound on the outer side of the second nanofiber modified layer 31. The tubular skeleton 10 may be a non-metal material such as metal or polypropylene, and is used for supporting the outer layer filter material, and the air flows out from the inner side of the tubular skeleton 10 along the radial direction. The cylindrical framework 10 is formed by enclosing hollow metal net or hollow material such as polypropylene, and the side wall of the cylindrical framework 10 is provided with a circulation hole for gas flow through the hollow, and gas enters from the upper end or the lower end of the cylindrical framework 10.
Taking the first nanofiber modified layer 21 and the first microfiber modified layer 22 as an example, the above seamless connection refers to that the end edge of the first nanofiber modified layer 21 and the head end edge of the first microfiber modified layer 22 are in seamless butt joint (not lap joint), and can be connected by adopting a bonding, stitching or other processing method. Of course, it is also within the scope of the present application to seamlessly butt-joint the distal end edge of the first nanofiber modification layer 21 and the head end edge of the first nanofiber modification layer 22 without fixing treatment.
The embodiment of the application can ensure lower pressure drop, has higher filtration efficiency on submicron liquid drops (especially liquid drops in the most easily penetrated particle size range) and micron liquid drops, and can effectively reduce the phenomenon of secondary entrainment of liquid drops.
The embodiment of the application is particularly suitable for the working condition with higher requirements on submicron liquid drops (especially liquid drops in the most easily penetrating particle size range), and the advantages of high filtration efficiency of the nanofiber modified layer and high liquid discharge capacity of the nanofiber modified layer are comprehensively utilized through the alternate composite structure, so that multistage coupling of coalescence growth and discharge of the liquid drops is realized, and the nanofiber modified layer in the composite structure also serves as a prefilter.
It should be noted that, the nanofiber is prepared by an electrostatic spinning technology (of course, the preparation method of the nanofiber is not limited to the electrostatic spinning technology, and can be prepared by a stretching method, a melt blowing technology or other related methods), and the solute selected by the spinning solution comprises organic materials, inorganic materials or organic/inorganic composite materials such as polyacrylonitrile, polyimide, nylon, polystyrene, polyurethane, polyvinylidene fluoride and the like. The nanofiber modification layers are treated by low-pressure plasmas, so that the fiber surfaces have hydrophobic and oleophobic characteristics, and the phenomenon that the pressure drop is overlarge due to the fact that trapped liquid drops form a compact liquid film in the nanofiber modification layers is effectively prevented.
The micrometer fiber material can be selected from non-metal fiber materials such as glass fiber, polyester fiber, polypropylene fiber, etc., and metal fiber materials such as stainless steel, etc. The micro-fiber modification layers can adopt low-pressure plasma treatment to enable the fiber surfaces to have super-hydrophilic and super-oleophylic characteristics, so that droplets discharged from the adjacent upstream (upstream on the side close to the cylindrical framework 10) nano-fiber modification layers of the micro-fiber modification layers are rapidly absorbed and discharged downwards along the fiber surfaces, and timely liquid discharge is achieved to ensure lower filtration pressure drop.
The low-pressure plasma treatment refers to selecting a proper process gas as a generating source, entering the filter material from a process gas inlet, providing energy for a discharge electrode by a radio-frequency power supply, carrying out plasma treatment on the process gas entering the filter material from the gas inlet, placing the treated filter material above a filter material tray, and carrying out chemical action on the generated plasma and the surface of the filter material so as to ensure that the filter material obtains the required super-hydrophilic super-oleophilic or hydrophobic oleophobic characteristic. In the treatment process, the vacuum pump is used for exhausting air, so that the inside of the cavity is in a low-pressure state, and the absolute pressure is lower than 10Pa, thereby ensuring that the inside of each pore of the filter material can be uniformly treated. The hydrophobic and oleophobic modification process gas can be a gas containing low surface energy elements or a gas obtained by evaporating corresponding liquid, and the super-hydrophilic and super-oleophilic modification process gas can be a gas containing hydrophilic functional groups or a gas obtained by evaporating corresponding liquid. The surface modification treatment time of the nanofiber filter layer is preferably 2-8min, and the surface modification treatment time of the microfiber filter layer is preferably 5-15min.
Wherein, the hydrophobic and oleophobic characteristics are tested according to international standards, the oleophobic characteristics at least reach 2 grades (ISO 14419-2010, textile oleophobic test standard), and the hydrophobic characteristics reach 100 minutes (AATCC 22-2010, hydrophobic test standard). Super hydrophilic super oleophilic properties mean that for distilled water and different oils used in international standard ISO 14419-2010, when 5 μl of liquid is selected to be dropped onto the material surface, the initial contact angle measured by the contact angle meter is close to 0 ° and the liquid rapidly disappears within 1 second.
Preferably, the composite modified gas-liquid coalescing filter further comprises a third filter layer 40, the third filter layer 40 comprises a third nanofiber modified layer 41 and a third nanofiber modified layer 42, the first end edge of the third nanofiber modified layer 41 is in seamless connection with the tail end edge of the second nanofiber modified layer 32, the third nanofiber modified layer 41 is wound on the outer side of the second nanofiber modified layer 32, the first end edge of the third nanofiber modified layer 42 is in seamless connection with the tail end edge of the third nanofiber modified layer 41, and the third nanofiber modified layer 42 is wound on the outer side of the third nanofiber modified layer 41. The third filter layer 40 is also treated with a low pressure plasma. In the embodiment of the present application, the heights of the first filter layer 20, the second filter layer 30 and the third filter layer 40 are all set along the vertical direction in fig. 1, and the heights of the first filter layer 20, the second filter layer 30 and the third filter layer 40 are all the same as the axial height of the cylindrical skeleton 10. Wherein, the lengths of the first, second and third filter layers 20, 30 and 40 are lengths along the circumferential direction of the cylindrical skeleton 10 in fig. 1, and the widths of the first, second and third filter layers 20, 30 and 40 are heights in the vertical direction.
It should be noted that, in the embodiment of the present application, the above-mentioned filter layers (the first filter layer 20, the second filter layer 30 and the third filter layer 40) may be multiple layers, for example, two to six layers, and may be higher than six layers under special working conditions. The arrangement of the above-described multi-layer filter layers may be the same as that in the above-described embodiments. And the above-described multi-layer filter layers are processed in the same manner as the first filter layer 20, the second filter layer 30, and the third filter layer 40, for example, by low-pressure plasma treatment.
In the embodiment of the present application, an upper annular fixing portion is provided at the upper end of the cylindrical skeleton 10, and a lower annular fixing portion is provided at the lower end of the cylindrical skeleton 10. The upper annular fixing portion and the lower annular fixing portion are both fixed on the cylindrical skeleton 10, the upper ends of the plurality of filter layers in the vertical direction in fig. 1 are both adhered to the upper annular fixing portion of the cylindrical skeleton 10, and the lower ends of the plurality of filter layers in the vertical direction in fig. 1 are both adhered to the lower annular fixing portion of the cylindrical skeleton 10.
Further, the pore size of the nanofiber modified layer in each filter layer gradually increases in the direction from inside to outside in the radial direction of the cylindrical skeleton 10, and the pore size of the nanofiber modified layer in each filter layer also gradually increases. Taking a three-layer filter layer as an example, the pore diameters of the first nanofiber modified layer 21, the second nanofiber modified layer 31 and the third nanofiber modified layer 41 gradually increase along the radial direction of the cylindrical skeleton 10 from inside to outside; the pore sizes of the first, second and third microfiber modified layers 22, 32, 42 gradually increase.
The pore diameter increasing structure is formed among different layers from inside to outside of each nanofiber modified layer, so that the mutual matching of the fiber pore diameter and the droplet size growth is realized, the pore diameter of each nanofiber modified layer is gradually increased according to the droplet coalescence growth mechanism, and the phenomenon of overlarge pressure drop caused by completely using the nanofiber modified layer with the minimum pore diameter is avoided while higher filtration efficiency is ensured. The pore diameter increasing structure is formed among different layers of each micron-sized fiber modified layer from inside to outside, so that the sizes of a liquid discharge channel and discharged liquid drops are mutually matched, effective liquid discharge is ensured, and pressure drop and operation cost are reduced.
Specifically, the ratio of the pore diameter of the first nanofiber modified layer 21 to the pore diameter of the second nanofiber modified layer 31 is 0.3 to 0.9, wherein the preferred ratio of the pore diameter of the first nanofiber modified layer 21 to the pore diameter of the second nanofiber modified layer 31 is 0.4 to 0.8. The ratio of the pore size of the first microfiber modified layer 22 to the pore size of the second microfiber modified layer 32 is 0.4 to 0.9, wherein the preferred ratio of the pore size of the first microfiber modified layer 22 to the pore size of the second microfiber modified layer 32 is 0.5 to 0.8. The pore diameter of the second nanofiber modified layer 31 and the pore diameter of the third nanofiber modified layer 41 are preferably 0.3 to 0.9, wherein the pore diameter of the second nanofiber modified layer 31 and the pore diameter of the third nanofiber modified layer 41 are preferably 0.4 to 0.8. The pore size of the second microfiber modified layer 32 and the pore size of the third microfiber modified layer 42 are preferably in the range of 0.4 to 0.9, wherein the pore size of the second microfiber modified layer 32 and the pore size of the third microfiber modified layer 42 are preferably in the range of 0.5 to 0.8.
In the embodiment of the present application, the fiber diameter of the first nanofiber modified layer 21 ranges from 10 nm to 400nm, and the thickness ranges from 5 μm to 25 μm. The second nanofiber modified layer 31 has a fiber diameter ranging from 100 to 600nm and a thickness ranging from 5 to 25 μm. The third nanofiber modified layer 41 has a fiber diameter ranging from 200 to 1000nm and a thickness ranging from 5 to 25 μm. When the number of the nanofiber modified layers is more than three, the preferable fiber diameter range of the fourth layer and the later layers is 400-1000nm, the thickness range is 5-25 μm, and the fiber diameter of the later layer is not smaller than the fiber diameter of the former layer.
The first microfiber modified layer 22 has a fiber diameter in the range of 1-10 μm and a thickness in the range of 0.1-3mm. The second microfiber modified layer 32 has a fiber diameter in the range of 5-20 μm and a thickness in the range of 0.1-3mm. The third microfiber modified layer 42 has a fiber diameter in the range of 10-30 μm and a thickness in the range of 0.1-3mm. When the number of the micro fiber modified layers is more than three, the preferable fiber diameter range of the fourth layer and the later layers is 10-30 μm, the thickness range is 0.1-3mm, and the fiber diameter of the later layer is not less than the fiber diameter of the former layer.
The embodiment of the application adopts a 4/3-circle winding mode, wherein the 4/3-circle winding mode means that 4/3 circles of nano fibers are wound along the outer surface of the cylindrical framework 10, and the micro fibers are continuously wound at the joint edges of the redundant 1/3 circles of nano fibers for one circle. The nanofiber modified layer is wound on the edge of the microfiber for 4/3 circles, and the nanofiber modified layer is alternately wound to form the structure shown in fig. 2, so that three layers at the edge joint of the adjacent nanofiber modified layers form a cycle, and the adjacent nanofiber modified layers are staggered according to 120 degrees. Preferably, the winding can be performed in a 6/5-3/2 winding mode according to different working condition requirements.
In the embodiment of the application, the filter layers and the nanofiber modified layer and the microfiber modified layer of the same filter layer are fixed by adhesion. Take the first filter layer and the second filter layer as examples. The first nanofiber modified layer 21 of the first filtration layer is wound outside the cylindrical skeleton 10, and the distal inner side surface of the first nanofiber modified layer 21 is stuck on the outer side of the first nanofiber modified layer 21 located on the inner side. The first nanofiber modified layer 22 has a distal end portion abutting against a distal end portion of the first nanofiber modified layer 21, and the first nanofiber modified layer 21 is attached to the inside of the first nanofiber modified layer 22. The inner side of the distal end of the first nanofiber modified layer 22 is attached to the outer side of the head end of the first nanofiber modified layer 21.
In the embodiment of the application, a staggered glue spraying mode is adopted, wherein the staggered glue spraying mode is to spray glue by atomizing the adhesive by compressed air, and the apparent pressure range of the compressed air arranged by different adhesives is 0.1-0.8bar. The apparent pressure is an optimal value and can be properly relaxed. The adhesive comprises common soluble glue and other glue which can be used for atomization. The glue spraying position is the inner side of the end part of each filter material (except the first nanofiber modified layer 21, the glue spraying position is arranged at the inner side of the tail end of the first nanofiber modified layer 21, the inner side of the head end is not arranged), and the optimal value of the glue spraying width is 6-15mm. The offset refers to that when both sides of the same material contain glue, for example, the inner side and the outer side of the head end of the first microfiber modified layer 22 are staggered with respect to each other along the axial direction of the cylindrical skeleton 10, as shown in fig. 3. Thereby helping to increase gas or liquid flow passages and reduce drag and operating costs. Meanwhile, the liquid drop interception efficiency can be improved. In the implementation process, the optimal distance between the adjacent glue spraying points along the axial direction of the cylindrical framework 10 is 1-5mm. Under proper conditions, glue can be sprayed between any fiber modified layers, and aging phenomenon caused by fiber separation or breakage is prevented, so that the integral strength of the filter is further improved. The air permeability experimental result shows that the pressure difference of the staggered glue spraying filter material is not increased by more than 22% compared with that of the common filter material, and the transverse tearing strength of the staggered glue spraying filter material is increased by 55.8% compared with that of the common filter material according to the filter material stretching experimental result, so that the strength is improved well.
Specifically, as shown in fig. 2 and 3, the distal inner side surface of the first nanofiber modified layer 21 is adhered to the outer side of the first nanofiber modified layer 21 located in the inner ring through a fourth adhesive layer. The first end of the first microfiber modified layer 22 is abutted against the end of the first nanofiber modified layer 21, the inner side of the first end of the first microfiber modified layer 22 is attached to the outer side of the first nanofiber modified layer 21 through a first adhesive layer, the inner side of the end of the first microfiber modified layer 22 is attached to the outer side of the end of the first nanofiber modified layer 21 through a second adhesive layer, and the inner side of the first end of the second nanofiber modified layer 31 is attached to the outer side of the end of the first microfiber modified layer 22 through a third adhesive layer. The inner side of the head end of the second nanofiber modified layer 32 is adhered to the second nanofiber modified layer 31 through a fifth adhesive layer. The first glue layer is composed of a plurality of first glue spraying points 61, the second glue layer is composed of a plurality of second glue spraying points, the third glue layer is composed of a plurality of third glue spraying points 62, the fourth glue layer is composed of a plurality of fourth glue spraying points, the fifth glue layer is composed of a plurality of fifth glue spraying points, and the plurality of first glue spraying points 61 and the plurality of third glue spraying points 62 are arranged in a staggered mode along the axial direction of the cylindrical framework 10. The second glue spraying points and the fourth glue spraying points are arranged in a staggered manner along the axial direction of the cylindrical framework 10.
In the embodiment of the present application, there may be a plurality of positions where staggered glue spraying is required, for example, a position where staggered glue spraying can occur every 120 ° in the circumferential direction in fig. 3. In the embodiment of the application, the head end and the tail end of each fiber modified layer are adhered to the outer side of the adjacent fiber modified layer positioned on the inner ring. When the two sides of the same limiting modification layer at the same position all contain glue spraying points, the glue spraying points at the two sides should be staggered, and the repeated description is omitted here.
The composite modified gas-liquid coalescing filter further comprises a drainage layer 50, wherein the head end of the drainage layer 50 is in seamless connection with the tail end of the second micro-fiber modified layer 32, and the tail end of the drainage layer 50 is attached to the second micro-fiber modified layer 32 on the inner side. In the embodiment of the present application, when the inner filter layer is a plurality of layers, both ends of the drainage layer 50 are correspondingly connected to the outermost filter layer. The drainage layer 50 is made of non-woven fabric or woven fabric, the thickness is in the range of 0.1-3mm, the average pore diameter is more than 70 mu m, the outer layer protection and drainage effects are achieved, the phenomenon of secondary entrainment of liquid drops can be effectively avoided through the synergistic effect of the drainage layer and the micron fiber modified layer, two combination modes of staggered glue spraying or knitting are adopted at the edge, preferably, two combination modes are simultaneously selected, and the bonding strength of the outermost layer is ensured. Under specific conditions, a metal frame such as stainless steel may be added to the outermost side. The staggered glue spraying mode is the same as the staggered glue spraying mode. The knitting is performed by sewing the liquid discharge layer 50 along the edges.
A comparison experiment is carried out by selecting the composite modified gas-liquid coalescing filter and the traditional gas-liquid coalescing filter in the embodiment of the application, and the filtering performance in the embodiment of the application is obviously improved compared with that of the traditional gas-liquid coalescing filter.
The specific experimental parameters are as follows: the average pore diameter ratio of each nanofiber modified layer of the composite modified gas-liquid coalescing filter is 0.5, the average pore diameter ratio of each nanofiber modified layer is 0.6, and the average pore diameter ratio of each nanofiber modified layer to the corresponding nanofiber modified layer (e.g., the first nanofiber modified layer to the first nanofiber modified layer) is 13. The apparent air flow speed of the filter inlet is 0.1m/s, the oil (dioctyl sebacate, DEHS) specified in the international test standard EN779 is adopted to generate aerosol, the particle size range of liquid drops in the inlet aerosol is 0.04-20 mu m, and the concentration is 500-550mg/m 3 。
In fig. 4, the abscissa represents the liquid accumulation amount per unit area and the ordinate represents the process pressure drop, wherein curve 1 in fig. 4 represents the embodiment of the present application and curve 2 represents the prior art. In fig. 5, the abscissa indicates the particle size and the ordinate indicates the filtration efficiency. Wherein curve 1 in fig. 5 represents an embodiment of the present application and curve 2 represents the prior art. The experimental results are as follows: with the increase of the liquid accumulation amount in unit area, the pressure drop increasing process of the filter is slower, more liquid is discharged from the bottom of the filter in the filtering process, and the trapped liquid can not block the airflow channel, so that the service life of the filter is prolonged; at the same time, the steady-state pressure drop of the filter of the present application is relatively low, decreasing by about 600Pa. The steady-state filtering efficiency of the filter is obviously superior to that of the traditional filter, the highest value of the penetration rate (1 minus the efficiency value, namely the penetration rate plus the efficiency value=1, wherein the efficiency value is common knowledge in the field) is reduced from 4.85 percent to 1.76 percent, the filtering efficiency of liquid drops in the most penetrating particle size range is obviously improved, and meanwhile, the phenomenon of secondary entrainment of liquid drops can be effectively reduced for the liquid drops with the particle size of more than 4 mu m.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
in the aspect of appearance design, compared with a traditional gas-liquid coalescing filter or a modularized combined filtering coalescing filter device, the application has the advantages of compact structure and convenient installation and use.
In terms of structure, by adopting a novel structural design of alternately compounding the nanofiber modified layers and the microfiber modified layers, compared with the direct compounding of a plurality of layers of nanofibers, the application solves the problem of insufficient internal effusion and liquid discharge channels caused by thicker nanofiber modified layers, thereby ensuring high-efficiency filtration and simultaneously having lower pressure drop. On the basis, each nanofiber modification layer is provided with an aperture increasing structure, so that the average aperture relative value is optimized, the coalescence growth of liquid drops in the filter material and the aperture of the nanofiber modification layer form a matching relationship, and the filter pressure drop and the running cost are reduced; and the pore diameter increasing structure is arranged on each micron fiber modified layer, so that the matching relationship between liquid draining liquid drops in the filter material and the pore diameter of the micron fiber modified layer is facilitated, the smooth discharge of the liquid drops is promoted, and the filter pressure drop and the running cost are further reduced.
Through the synergistic effect of each micron fiber modified layer and the outermost liquid discharge layer in the filter, the filter can smoothly discharge liquid under the working conditions of different inlet gas liquid contents, and the phenomenon of secondary entrainment of liquid drops is reduced.
In the aspect of processing, the 4/3-circle winding mode is arranged on the nanofiber modified layer, so that leakage points are avoided, and the integrality of the filtering effect of each part of the filter is ensured. The combination of the edge joints of different layers in a staggered glue spraying mode can ensure the strength without influencing the effective filtering area, and the increase of the filtering resistance caused by glue is not obvious; meanwhile, the staggered glue spraying can form a bending channel, so that liquid drops can be trapped through interception and inertia effects, and the filtering efficiency is improved.
In the aspect of material modification treatment, the nanofiber modification layer and the microfiber modification layer are respectively subjected to hydrophobic oleophobic treatment and super-hydrophilic super-oleophilic treatment by a low-pressure plasma surface modification technology, so that the environment is protected, no treatment solvent is wasted, uniform surface treatment of each fiber in the filter material can be ensured, the effect is permanent, and the treatment cost is reduced by more than 50 percent relative to that of a solution.
Compared with the traditional gas-liquid coalescing filter, the embodiment of the application can effectively reduce the production and operation costs by more than 30%. Under the same working condition, compared with the service life of the traditional filter, which is 3 months on average, the filter can effectively prolong the service life by more than 2 months.
The foregoing description of the embodiments of the application is not intended to limit the scope of the application, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the application shall fall within the scope of the patent. In addition, the technical characteristics and technical scheme, technical characteristics and technical scheme can be freely combined for use.
Claims (10)
1. A composite modified gas-liquid coalescing filter, the composite modified gas-liquid coalescing filter comprising:
a cylindrical skeleton (10);
the first filter layer (20) comprises a first nanofiber modified layer (21) and a first micrometer fiber modified layer (22), wherein the first nanofiber modified layer (21) and the first micrometer fiber modified layer (22) are wound on the cylindrical framework (10) at least for one circle respectively, the head end of the first nanofiber modified layer (21) is arranged on the outer wall surface of the cylindrical framework (10), the head end edge of the first micrometer fiber modified layer (22) is in seamless connection with the tail end edge of the first nanofiber modified layer (21), and the first micrometer fiber modified layer (22) is wound on the outer side of the first nanofiber modified layer (21);
the second filter layer (30) comprises a second nanofiber modified layer (31) and a second micrometer fiber modified layer (32), the second nanofiber modified layer (31) and the second micrometer fiber modified layer (32) are wound on the cylindrical framework (10) at least for one circle respectively, the head end edge of the second nanofiber modified layer (31) is in seamless connection with the tail end edge of the first micrometer fiber modified layer (22), the second nanofiber modified layer (31) is wound on the outer side of the first micrometer fiber modified layer (22), the head end edge of the second micrometer fiber modified layer (32) is in seamless connection with the tail end edge of the second nanofiber modified layer (31), and the second micrometer fiber modified layer (32) is wound on the outer side of the second nanofiber modified layer (31);
the pore diameters of the first nanofiber modified layer and the second nanofiber modified layer are gradually increased; the pore diameters of the first micrometer fiber modified layer and the second micrometer fiber modified layer are gradually increased;
the first nanofiber modified layer (21) and the second nanofiber modified layer (31) have hydrophobic and oleophobic properties, and the first microfiber modified layer (22) and the second microfiber modified layer (32) have super-hydrophilic and super-oleophilic properties;
the ratio of the pore diameter of the first nanofiber modified layer (21) to the pore diameter of the second nanofiber modified layer (31) is 0.3 to 0.9, and the ratio of the pore diameter of the first microfiber modified layer (22) to the pore diameter of the second microfiber modified layer (32) is 0.4 to 0.9.
2. The composite modified gas-liquid coalescing filter according to claim 1, further comprising a third filter layer (40), wherein the third filter layer (40) comprises a third nanofiber modified layer (41) and a third microfiber modified layer (42), a head end edge of the third nanofiber modified layer (41) is in seamless connection with a tail end edge of the second nanofiber modified layer (32), the third nanofiber modified layer (41) is wound outside the second nanofiber modified layer (32), a head end edge of the third nanofiber modified layer (42) is in seamless connection with a tail end edge of the third nanofiber modified layer (41), and the third nanofiber modified layer (42) is wound outside the third nanofiber modified layer (41).
3. The composite modified gas-liquid coalescing filter according to claim 2 wherein the flow direction along the radial direction of the cylindrical skeleton (10) is from inside to outside,
the pore diameters of the first nanofiber modified layer (21), the second nanofiber modified layer (31) and the third nanofiber modified layer (41) are gradually increased;
the pore sizes of the first microfiber modified layer (22), the second microfiber modified layer (32) and the third microfiber modified layer (42) are gradually increased.
4. The composite modified-gas-liquid coalescing filter according to claim 2, wherein the pore size of the second nanofiber modified layer (31) and the pore size ratio of the third nanofiber modified layer (41) are 0.3 to 0.9, and the pore size ratio of the second microfiber modified layer (32) and the third microfiber modified layer (42) are 0.4 to 0.9.
5. The composite modified gas-liquid coalescing filter according to claim 1 wherein,
the first nanofiber modification layer (21), the second nanofiber modification layer (31) and the third nanofiber modification layer (41) are each 5 to 25 microns thick;
the first (22), second (32) and third (42) microfiber modified layers are each 0.1mm to 3mm thick.
6. The composite modified gas-liquid coalescing filter according to claim 1, wherein a head end inner side of the first microfiber modified layer (22) is bonded to an outer side of the first nanofiber modified layer (21) through a first adhesive layer, a tail end inner side of the first microfiber modified layer (22) is bonded to a tail end outer side of the first nanofiber modified layer (21) through a second adhesive layer, and a head end inner side of the second nanofiber modified layer (31) is bonded to an outer side of the first microfiber modified layer (22) through a third adhesive layer.
7. The composite modified gas-liquid coalescing filter according to claim 6, wherein the first adhesive layer, the second adhesive layer and the third adhesive layer are each composed of a plurality of adhesive spraying points, and the plurality of adhesive spraying points of the first adhesive layer and the plurality of adhesive spraying points of the third adhesive layer are arranged in a staggered manner along the axial direction of the cylindrical skeleton (10).
8. The composite modified gas-liquid coalescing filter according to claim 1, further comprising a drainage layer (50), wherein a leading edge of the drainage layer (50) is seamlessly continuous with a trailing edge of the second microfiber modified layer (32), and wherein a trailing inner side of the drainage layer (50) is adhered to an outer side of the second microfiber modified layer (32).
9. The composite modified gas-liquid coalescing filter according to claim 1, wherein the pore diameter of the drainage layer (50) is 70 μm or more, and the thickness of the drainage layer (50) is 0.1 to mm mm to 3mm.
10. The composite modified gas-liquid coalescing filter according to claim 1, wherein the height direction of the first filter layer (20) and the height direction of the second filter layer (30) are each arranged along the axial direction of the cylindrical skeleton (10), and the height of the first filter layer (20) and the height of the second filter layer (30) are the same as the axial height of the cylindrical skeleton (10).
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| CN109847490A (en) * | 2019-03-20 | 2019-06-07 | 中国石油大学(北京) | A kind of rigidity gas-liquid Coalescence filter core, preparation method and device |
| CN112957834B (en) * | 2021-03-11 | 2021-11-19 | 中国石油大学(北京) | Switching two-stage coalescence-separation system |
| CN112973295B (en) * | 2021-03-18 | 2022-03-29 | 中国石油大学(北京) | Coalescence filter core with flowing back function |
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